Tips on Zello Communications During a Disaster

UPDATE 9/14/18: Please note this article was originally written during Hurricane Harvey in 2017, but the same tips apply for Hurricane Florence currently affecting the East Coast

DISCLAIMER: This information is a guide for Zello users. It is not intended as a replacement for instructions from government emergency agencies or sanctioned rescue organizations. Please use at your own risk and discretion.

We have seen a large number of people signing up for Zello in preparation for Hurricane Irma. Over 1 million people have joined in the last day, with most coming from Puerto Rico and Florida. While Zello has been helpful in Harvey relief efforts, it is not a hurricane rescue tool and is only as useful as the people who use it, and as reliable as the data network available. This information will help you understand what Zello can and cannot do, and how to be better prepared.

During and after a disaster:

If there is no WiFi and no cellular data service, communication apps (including Zello) won't work. However, this may not be an issue because, historically, mobile data networks have often remained at least partially operational, even after a severe disaster. Cellular towers include battery or generator backup power, which lets them stay online for at least 2 hours, even after grid power is lost.

After a disaster, mobile networks will typically be overloaded with phone calls so don't make phone calls unless you have an emergency and need to call 911. This will not only allow emergency calls to go through better, but will also extend the lifespan of mobile towers running on backup power.

Text messaging apps and Zello use a fraction of bandwidth of phone calls and will often work when phone calls won't get through.

Zello is suitable for real-time, large-group communications. Unlike texting, it may be more accessible to elderly people or small kids

When actively used, Zello will use a lot of battery. You can do the following to minimize battery drain:

Keep your phone fully charged and have an external battery pack

Turn phone screen off while listening unless you are connected to a power source -- that will extend battery life of the phone by at least 2x

If your phone battery is under 30%, turn off Zello. That way, it won't use any power, and if someone sends you a message, you will still receive a push notification.

Different carriers use different networks and equipment, so it is best to have SIM cards from all the providers offering cell coverage in your area. For example, if you are using Verizon as your primary line, get a T-Mobile SIM card as a backup. Zello runs on all carriers

2G/3G and 4G networks, even from the same operator, may use different equipment. So if you cannot connect when using 4G, try switching to 2G or 3G, and it may start working. Zello is designed to work with the lowest bandwidth available and has been tested on 2G networks.

Before a disaster:

Obey all evacuation orders! If you are in Florida, consider taking a few days off and visiting relatives. The best disaster communication is the one that never has to happen.

Use Zello channels to coordinate group efforts of getting supplies, gas, preparing house for the wind and rain. That way, you will get familiar with how Zello works. Instructions for iPhone, Android, and Blackberry can be found in our User Guides

Find and connect to the local search and rescue channels on Zello or, if there is none, make your own.

Memorize your username and password. If your phone is damaged or battery is dead, you can install Zello on another device and re-connect with your contacts and channels.

Write down important phone numbers on a piece of cardboard and place in a waterproof baggie. If your phone goes dead, you can give this to rescuers in order to contact your family and friends and inform them that you are fine.